When someone with a runny nose suddenly laughs and makes a bugger bubble unexpectedly.
Person 1 - Sarah laughed so quickly she made a booger bubble!
Parson 2 - lol her allergies give a lot of giggle bubbles!
When you are feeling extremely horny and you try to hold back laughter, but you fail and end up snorting. Usually resulting in a boner kill.
"She was about to suck my dick, but then i got major under giggle."